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<?php |
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/* |
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Plugin Name: Google Authenticator |
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Plugin URI: http://henrik.schack.dk/google-authenticator-for-wordpress |
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Description: Two-Factor Authentication for WordPress using the Android/iPhone/Blackberry app as One Time Password generator. |
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Author: Henrik Schack |
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Version: 0.39 |
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Author URI: http://henrik.schack.dk/ |
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Compatibility: WordPress 3.2.1 |
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Text Domain: google-authenticator |
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Domain Path: /lang |
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|
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---------------------------------------------------------------------------- |
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|
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Thanks to Bryan Ruiz for his Base32 encode/decode class, found at php.net. |
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Thanks to Tobias B�thge for his major code rewrite and German translation. |
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Thanks to Pascal de Bruijn for his relaxed mode idea. |
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Thanks to Daniel Werl for his usability tips. |
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|
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---------------------------------------------------------------------------- |
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|
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Copyright 2011 Henrik Schack (email : henrik@schack.dk) |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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class GoogleAuthenticator { |
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|
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static $instance; // to store a reference to the plugin, allows other plugins to remove actions |
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|
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/** |
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* Constructor, entry point of the plugin |
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*/ |
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function __construct() { |
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self::$instance = $this; |
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add_action( 'init', array( $this, 'init' ) ); |
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} |
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|
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/** |
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* Initialization, Hooks, and localization |
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*/ |
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function init() { |
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require_once( 'base32.php' ); |
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|
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add_action( 'login_form', array( $this, 'loginform' ) ); |
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add_filter( 'authenticate', array( $this, 'check_otp' ), 50, 3 ); |
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|
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if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) |
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add_action( 'wp_ajax_GoogleAuthenticator_action', array( $this, 'ajax_callback' ) ); |
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|
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add_action( 'personal_options_update', array( $this, 'personal_options_update' ) ); |
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add_action( 'profile_personal_options', array( $this, 'profile_personal_options' ) ); |
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add_action( 'edit_user_profile', array( $this, 'edit_user_profile' ) ); |
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add_action( 'edit_user_profile_update', array( $this, 'edit_user_profile_update' ) ); |
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|
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load_plugin_textdomain( 'google-authenticator', false, basename( dirname( __FILE__ ) ) . '/lang' ); |
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} |
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|
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/** |
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* Check the verification code entered by the user. |
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*/ |
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function verify( $secretkey, $thistry, $relaxedmode ) { |
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|
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// If user is running in relaxed mode, we allow more time drifting |
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// �4 min, as opposed to � 30 seconds in normal mode. |
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if ( $relaxedmode == 'enabled' ) { |
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$firstcount = -8; |
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$lastcount = 8; |
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} else { |
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$firstcount = -1; |
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$lastcount = 1; |
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} |
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|
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$tm = floor( time() / 30 ); |
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|
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$secretkey=Base32::decode($secretkey); |
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// Keys from 30 seconds before and after are valid aswell. |
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for ($i=$firstcount; $i<=$lastcount; $i++) { |
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// Pack time into binary string |
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$time=chr(0).chr(0).chr(0).chr(0).pack('N*',$tm+$i); |
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// Hash it with users secret key |
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$hm = hash_hmac( 'SHA1', $time, $secretkey, true ); |
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// Use last nipple of result as index/offset |
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$offset = ord(substr($hm,-1)) & 0x0F; |
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// grab 4 bytes of the result |
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$hashpart=substr($hm,$offset,4); |
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// Unpak binary value |
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$value=unpack("N",$hashpart); |
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$value=$value[1]; |
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// Only 32 bits |
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$value = $value & 0x7FFFFFFF; |
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$value = $value % 1000000; |
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if ( $value == $thistry ) { |
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return true; |
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} |
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} |
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return false; |
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} |
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|
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/** |
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* Create a new random secret for the Google Authenticator app. |
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* 16 characters, randomly chosen from the allowed Base32 characters |
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* equals 10 bytes = 80 bits, as 256^10 = 32^16 = 2^80 |
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*/ |
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function create_secret() { |
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$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'; // allowed characters in Base32 |
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$secret = ''; |
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for ( $i = 0; $i < 16; $i++ ) { |
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$secret .= substr( $chars, wp_rand( 0, strlen( $chars ) - 1 ), 1 ); |
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} |
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return $secret; |
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} |
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|
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|
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/** |
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* Add verification code field to login form. |
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*/ |
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function loginform() { |
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echo "\t<p>\n"; |
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echo "\t\t<label><a href=\"http://code.google.com/p/google-authenticator/\" target=\"_blank\" title=\"".__('If you don\'t have Google Authenticator enabled for your WordPress account, leave this field empty.','google-authenticator')."\">".__('Google Authenticator code','google-authenticator')."</a><span id=\"google-auth-info\"></span><br />\n"; |
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echo "\t\t<input type=\"text\" name=\"otp\" id=\"user_email\" class=\"input\" value=\"\" size=\"20\" tabindex=\"25\" /></label>\n"; |
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echo "\t</p>\n"; |
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} |
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|
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|
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/** |
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* Login form handling. |
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* Check Google Authenticator verification code, if user has been setup to do so. |
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* @param wordpressuser |
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* @return user/loginstatus |
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*/ |
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function check_otp( $user, $username = '', $password = '' ) { |
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// Store result of loginprocess, so far. |
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$userstate = $user; |
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|
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// Get information on user, we need this in case an app password has been enabled, |
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// since the $user var only contain an error at this point in the login flow. |
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$user = get_userdatabylogin( $username ); |
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|
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// Does the user have the Google Authenticator enabled ? |
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if ( trim(get_user_option( 'googleauthenticator_enabled', $user->ID ) ) == 'enabled' ) { |
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|
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// Get the users secret |
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$GA_secret = trim( get_user_option( 'googleauthenticator_secret', $user->ID ) ); |
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|
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// Figure out if user is using relaxed mode ? |
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$GA_relaxedmode = trim( get_user_option( 'googleauthenticator_relaxedmode', $user->ID ) ); |
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|
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// Get the verification code entered by the user trying to login |
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$otp = intval( trim( $_POST[ 'otp' ] ) ); |
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|
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// Valid code ? |
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if ( $this->verify( $GA_secret, $otp, $GA_relaxedmode ) ) { |
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return $userstate; |
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} else { |
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// No, lets see if an app password is enabled, and this is an XMLRPC / APP login ? |
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if ( trim( get_user_option( 'googleauthenticator_pwdenabled', $user->ID ) ) == 'enabled' && ( defined('XMLRPC_REQUEST') || defined('APP_REQUEST') ) ) { |
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$GA_passwords = json_decode( get_user_option( 'googleauthenticator_passwords', $user->ID ) ); |
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$passwordsha1 = trim($GA_passwords->{'password'} ); |
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$usersha1 = sha1( strtoupper( str_replace( ' ', '', $password ) ) ); |
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if ( $passwordsha1 == $usersha1 ) { |
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return new WP_User( $user->ID ); |
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} else { |
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// Wrong XMLRPC/APP password ! |
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return new WP_Error( 'invalid_google_authenticator_password', __( '<strong>ERROR</strong>: The Google Authenticator password is incorrect.', 'google-authenticator' ) ); |
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} |
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} else { |
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return new WP_Error( 'invalid_google_authenticator_token', __( '<strong>ERROR</strong>: The Google Authenticator code is incorrect or has expired.', 'google-authenticator' ) ); |
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} |
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} |
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} |
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// Google Authenticator isn't enabled for this account, |
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// just resume normal authentication. |
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return $userstate; |
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} |
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|
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|
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/** |
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* Extend personal profile page with Google Authenticator settings. |
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*/ |
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function profile_personal_options() { |
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global $user_id, $is_profile_page; |
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|
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$GA_secret = trim( get_user_option( 'googleauthenticator_secret', $user_id ) ); |
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$GA_enabled = trim( get_user_option( 'googleauthenticator_enabled', $user_id ) ); |
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$GA_relaxedmode = trim( get_user_option( 'googleauthenticator_relaxedmode', $user_id ) ); |
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$GA_description = trim( get_user_option( 'googleauthenticator_description', $user_id ) ); |
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$GA_pwdenabled = trim( get_user_option( 'googleauthenticator_pwdenabled', $userid ) ); |
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$GA_password = trim( get_user_option( 'googleauthenticator_passwords', $user_id ) ); |
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|
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// We dont store the generated app password in cleartext so there is no point in trying |
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// to show the user anything except from the fact that a password exists. |
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if ( $GA_password != '' ) { |
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$GA_password = "XXXX XXXX XXXX XXXX"; |
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} |
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|
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// In case the user has no secret ready (new install), we create one. |
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if ( '' == $GA_secret ) { |
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$GA_secret = $this->create_secret(); |
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} |
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|
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// Use "WordPress Blog" as default description |
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if ( '' == $GA_description ) { |
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$GA_description = __( 'WordPress Blog', 'google-authenticator' ); |
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} |
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|
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echo "<h3>".__( 'Google Authenticator Settings', 'google-authenticator' )."</h3>\n"; |
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|
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echo "<table class=\"form-table\">\n"; |
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echo "<tbody>\n"; |
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echo "<tr>\n"; |
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echo "<th scope=\"row\">".__( 'Active', 'google-authenticator' )."</th>\n"; |
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echo "<td>\n"; |
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echo "<input name=\"GA_enabled\" id=\"GA_enabled\" class=\"tog\" type=\"checkbox\"" . checked( $GA_enabled, 'enabled', false ) . "/>\n"; |
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echo "</td>\n"; |
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echo "</tr>\n"; |
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|
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// Create URL for the Google charts QR code generator. |
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$chl = urlencode( "otpauth://totp/{$GA_description}?secret={$GA_secret}" ); |
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$qrcodeurl = "https://chart.googleapis.com/chart?cht=qr&chs=300x300&chld=H|0&chl={$chl}"; |
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|
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if ( $is_profile_page || IS_PROFILE_PAGE ) { |
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echo "<tr>\n"; |
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echo "<th scope=\"row\">".__( 'Relaxed mode', 'google-authenticator' )."</th>\n"; |
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echo "<td>\n"; |
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echo "<input name=\"GA_relaxedmode\" id=\"GA_relaxedmode\" class=\"tog\" type=\"checkbox\"" . checked( $GA_relaxedmode, 'enabled', false ) . "/><span class=\"description\">".__(' Relaxed mode allows for more time drifting on your phone clock (±4 min).','google-authenticator')."</span>\n"; |
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echo "</td>\n"; |
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echo "</tr>\n"; |
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|
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echo "<tr>\n"; |
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echo "<th><label for=\"GA_description\">".__('Description','google-authenticator')."</label></th>\n"; |
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echo "<td><input name=\"GA_description\" id=\"GA_description\" value=\"{$GA_description}\" type=\"text\" size=\"25\" /><span class=\"description\">".__(' Description that you\'ll see in the Google Authenticator app on your phone.','google-authenticator')."</span><br /></td>\n"; |
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echo "</tr>\n"; |
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|
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echo "<tr>\n"; |
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echo "<th><label for=\"GA_secret\">".__('Secret','google-authenticator')."</label></th>\n"; |
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echo "<td>\n"; |
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echo "<input name=\"GA_secret\" id=\"GA_secret\" value=\"{$GA_secret}\" readonly=\"readonly\" type=\"text\" size=\"25\" />"; |
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echo "<input name=\"GA_newsecret\" id=\"GA_newsecret\" value=\"".__("Create new secret",'google-authenticator')."\" type=\"button\" class=\"button\" />"; |
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echo "<input name=\"show_qr\" id=\"show_qr\" value=\"".__("Show/Hide QR code",'google-authenticator')."\" type=\"button\" class=\"button\" onclick=\"jQuery('#GA_QR_INFO').toggle('slow');\" />"; |
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echo "</td>\n"; |
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echo "</tr>\n"; |
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|
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echo "<tr>\n"; |
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echo "<th></th>\n"; |
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echo "<td><div id=\"GA_QR_INFO\" style=\"display: none\" >"; |
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echo "<img id=\"GA_QRCODE\" src=\"{$qrcodeurl}\" alt=\"QR Code\"/>"; |
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echo '<span class="description"><br/> ' . __( 'Scan this with the Google Authenticator app.', 'google-authenticator' ) . '</span>'; |
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echo "</div></td>\n"; |
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echo "</tr>\n"; |
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|
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echo "<tr>\n"; |
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echo "<th scope=\"row\">".__( 'Enable App password', 'google-authenticator' )."</th>\n"; |
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echo "<td>\n"; |
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echo "<input name=\"GA_pwdenabled\" id=\"GA_pwdenabled\" class=\"tog\" type=\"checkbox\"" . checked( $GA_pwdenabled, 'enabled', false ) . "/><span class=\"description\">".__(' Enabling an App password will decrease your overall login security.','google-authenticator')."</span>\n"; |
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echo "</td>\n"; |
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echo "</tr>\n"; |
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|
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echo "<tr>\n"; |
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echo "<th></th>\n"; |
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echo "<td>\n"; |
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echo "<input name=\"GA_password\" id=\"GA_password\" readonly=\"readonly\" value=\"".$GA_password."\" type=\"text\" size=\"25\" />"; |
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echo "<input name=\"GA_createpassword\" id=\"GA_createpassword\" value=\"".__("Create new password",'google-authenticator')."\" type=\"button\" class=\"button\" />"; |
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echo "<span class=\"description\" id=\"GA_passworddesc\">".__(' Password is not stored in cleartext, this is your only chance to see it.','google-authenticator')."</span>\n"; |
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echo "</td>\n"; |
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echo "</tr>\n"; |
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} |
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|
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|
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echo "</tbody></table>\n"; |
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echo "<script type=\"text/javascript\">\n"; |
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echo "var GAnonce='".wp_create_nonce('GoogleAuthenticatoraction')."';\n"; |
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echo <<<ENDOFJS |
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var pwdata; |
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jQuery('#GA_newsecret').bind('click', function() { |
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var data=new Object(); |
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data['action'] = 'GoogleAuthenticator_action'; |
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data['nonce'] = GAnonce; |
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jQuery.post(ajaxurl, data, function(response) { |
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jQuery('#GA_secret').val(response['new-secret']); |
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chl=escape("otpauth://totp/"+jQuery('#GA_description').val()+"?secret="+jQuery('#GA_secret').val()); |
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qrcodeurl="https://chart.googleapis.com/chart?cht=qr&chs=300x300&chld=H|0&chl="+chl; |
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jQuery('#GA_QRCODE').attr('src',qrcodeurl); |
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jQuery('#GA_QR_INFO').show('slow'); |
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}); |
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}); |
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|
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jQuery('#GA_description').bind('focus blur change keyup', function() { |
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chl=escape("otpauth://totp/"+jQuery('#GA_description').val()+"?secret="+jQuery('#GA_secret').val()); |
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qrcodeurl="https://chart.googleapis.com/chart?cht=qr&chs=300x300&chld=H|0&chl="+chl; |
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jQuery('#GA_QRCODE').attr('src',qrcodeurl); |
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}); |
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|
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jQuery('#GA_createpassword').bind('click',function() { |
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var data=new Object(); |
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data['action'] = 'GoogleAuthenticator_action'; |
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data['nonce'] = GAnonce; |
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data['save'] = 1; |
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jQuery.post(ajaxurl, data, function(response) { |
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jQuery('#GA_password').val(response['new-secret'].match(new RegExp(".{0,4}","g")).join(' ')); |
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jQuery('#GA_passworddesc').show(); |
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}); |
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}); |
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|
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jQuery('#GA_enabled').bind('change',function() { |
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GoogleAuthenticator_apppasswordcontrol(); |
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}); |
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|
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jQuery(document).ready(function() { |
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jQuery('#GA_passworddesc').hide(); |
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GoogleAuthenticator_apppasswordcontrol(); |
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}); |
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|
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function GoogleAuthenticator_apppasswordcontrol() { |
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if (jQuery('#GA_enabled').is(':checked')) { |
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jQuery('#GA_pwdenabled').removeAttr('disabled'); |
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jQuery('#GA_createpassword').removeAttr('disabled'); |
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} else { |
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jQuery('#GA_pwdenabled').removeAttr('checked') |
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jQuery('#GA_pwdenabled').attr('disabled', true); |
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jQuery('#GA_createpassword').attr('disabled', true); |
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} |
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} |
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</script> |
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ENDOFJS; |
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|
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} |
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|
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/** |
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* Form handling of Google Authenticator options added to personal profile page (user editing his own profile) |
| 343 |
*/ |
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function personal_options_update() { |
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global $user_id; |
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|
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$GA_enabled = trim( $_POST['GA_enabled'] ); |
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$GA_description = trim( $_POST['GA_description'] ); |
| 349 |
$GA_relaxedmode = trim( $_POST['GA_relaxedmode'] ); |
| 350 |
$GA_secret = trim( $_POST['GA_secret'] ); |
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$GA_pwdenabled = trim( $_POST['GA_pwdenabled'] ); |
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$GA_password = str_replace(' ', '', trim( $_POST['GA_password'] ) ); |
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|
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if ( '' == $GA_enabled ) { |
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$GA_enabled = 'disabled'; |
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} else { |
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$GA_enabled = 'enabled'; |
| 358 |
} |
| 359 |
|
| 360 |
if ( '' == $GA_relaxedmode ) { |
| 361 |
$GA_relaxedmode = 'disabled'; |
| 362 |
} else { |
| 363 |
$GA_relaxedmode = 'enabled'; |
| 364 |
} |
| 365 |
|
| 366 |
|
| 367 |
if ( '' == $GA_pwdenabled ) { |
| 368 |
$GA_pwdenabled = 'disabled'; |
| 369 |
} else { |
| 370 |
$GA_pwdenabled = 'enabled'; |
| 371 |
} |
| 372 |
|
| 373 |
// Only store password if a new one has been generated. |
| 374 |
if (strtoupper($GA_password) != 'XXXXXXXXXXXXXXXX' ) { |
| 375 |
// Store the password in a format that can be expanded easily later on if needed. |
| 376 |
$GA_password = array( 'appname' => 'Default', 'password' => sha1( $GA_password ) ); |
| 377 |
update_user_option( $user_id, 'googleauthenticator_passwords', json_encode( $GA_password ), true ); |
| 378 |
} |
| 379 |
|
| 380 |
update_user_option( $user_id, 'googleauthenticator_enabled', $GA_enabled, true ); |
| 381 |
update_user_option( $user_id, 'googleauthenticator_description', $GA_description, true ); |
| 382 |
update_user_option( $user_id, 'googleauthenticator_relaxedmode', $GA_relaxedmode, true ); |
| 383 |
update_user_option( $user_id, 'googleauthenticator_secret', $GA_secret, true ); |
| 384 |
update_user_option( $user_id, 'googleauthenticator_pwdenabled', $GA_pwdenabled, true ); |
| 385 |
|
| 386 |
} |
| 387 |
|
| 388 |
/** |
| 389 |
* Extend profile page with ability to enable/disable Google Authenticator authentication requirement. |
| 390 |
* Used by an administrator when editing other users. |
| 391 |
*/ |
| 392 |
function edit_user_profile() { |
| 393 |
global $user_id; |
| 394 |
$GA_enabled = trim( get_user_option( 'googleauthenticator_enabled', $user_id ) ); |
| 395 |
echo "<h3>".__('Google Authenticator Settings','google-authenticator')."</h3>\n"; |
| 396 |
echo "<table class=\"form-table\">\n"; |
| 397 |
echo "<tbody>\n"; |
| 398 |
echo "<tr>\n"; |
| 399 |
echo "<th scope=\"row\">".__('Active','google-authenticator')."</th>\n"; |
| 400 |
echo "<td>\n"; |
| 401 |
echo "<div><input name=\"GA_enabled\" id=\"GA_enabled\" class=\"tog\" type=\"checkbox\"" . checked( $GA_enabled, 'enabled', false ) . "/>\n"; |
| 402 |
echo "</td>\n"; |
| 403 |
echo "</tr>\n"; |
| 404 |
echo "</tbody>\n"; |
| 405 |
echo "</table>\n"; |
| 406 |
} |
| 407 |
|
| 408 |
/** |
| 409 |
* Form handling of Google Authenticator options on edit profile page (admin user editing other user) |
| 410 |
*/ |
| 411 |
function edit_user_profile_update() { |
| 412 |
global $user_id; |
| 413 |
|
| 414 |
$GA_enabled = trim( $_POST['GA_enabled'] ); |
| 415 |
|
| 416 |
if ( '' == $GA_enabled ) { |
| 417 |
$GA_enabled = 'disabled'; |
| 418 |
} else { |
| 419 |
$GA_enabled = 'enabled'; |
| 420 |
} |
| 421 |
|
| 422 |
update_user_option( $user_id, 'googleauthenticator_enabled', $GA_enabled, true ); |
| 423 |
} |
| 424 |
|
| 425 |
|
| 426 |
/** |
| 427 |
* AJAX callback function used to generate new secret |
| 428 |
*/ |
| 429 |
function ajax_callback() { |
| 430 |
global $user_id; |
| 431 |
|
| 432 |
// Some AJAX security |
| 433 |
check_ajax_referer( 'GoogleAuthenticatoraction', 'nonce' ); |
| 434 |
|
| 435 |
// Create new secret, using the users password hash as input for further hashing |
| 436 |
$secret = $this->create_secret(); |
| 437 |
|
| 438 |
$result = array( 'new-secret' => $secret ); |
| 439 |
header( 'Content-Type: application/json' ); |
| 440 |
echo json_encode( $result ); |
| 441 |
|
| 442 |
// die() is required to return a proper result |
| 443 |
die(); |
| 444 |
} |
| 445 |
|
| 446 |
} // end class |
| 447 |
|
| 448 |
new GoogleAuthenticator; |
| 449 |
?> |
